Much of Earth's water supply originated from which of the following?

Name: Much of Earth's water supply originated from which of the following?
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Scientists believe that much of Earth's water supply originated from icy comets that collided with the planet during its early formation. Comets are made up of ice, dust, and gas and can contain up to 50% water. As comets collided with the Earth, they brought vast amounts of water that eventually formed the oceans, lakes, and rivers we see today.

Much of Earth's Water Supply Originated from Which of the Following